2002 Ford E-Series Van

[quote:919c9e72ea="cruzazul11510"]Engine Performance problem
2002 Ford E-Series Van V8 Two Wheel Drive Automatic 380000 miles
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I have a code P1151 = lack of HO2S21 switch - Sens Indicates Lean; this E-350 is CNG (natural gas) How can I fix the problem ?[/quote:919c9e72ea]

Hello,

Here are the code def's I have and have found...

P1151 O2 Sensor Heater Circuit Signal Intermittent (Bank 2 Sensor 1)

P1151 Lack of Upstream Heated Oxygen Sensor Switch - Sensor Indicates Lean - Bank No. 2

P1151 Lack of Upstream Heated Oxygen Sensor Switch - Sensor Indicates Lean - Bank No. 2

So, I would change the O2 Sensor in the Exhaust Manifold on the Drivers Side, which would be Bank 2 sensor 1 or the Bank 2 Upstream Sensor.

THAKS; I will do that and I'll let you know.[quote:c75a5e6e46="obxautomedic"][quote:c75a5e6e46="cruzazul11510"]Engine Performance problem
2002 Ford E-Series Van V8 Two Wheel Drive Automatic 380000 miles
----------------------------------------------------------------
I have a code P1151 = lack of HO2S21 switch - Sens Indicates Lean; this E-350 is CNG (natural gas) How can I fix the problem ?[/quote:c75a5e6e46]

Hello,

Here are the code def's I have and have found...

P1151 O2 Sensor Heater Circuit Signal Intermittent (Bank 2 Sensor 1)

P1151 Lack of Upstream Heated Oxygen Sensor Switch - Sensor Indicates Lean - Bank No. 2

P1151 Lack of Upstream Heated Oxygen Sensor Switch - Sensor Indicates Lean - Bank No. 2

So, I would change the O2 Sensor in the Exhaust Manifold on the Drivers Side, which would be Bank 2 sensor 1 or the Bank 2 Upstream Sensor.[/quote:c75a5e6e46]